JPS592633Y2 - Keibiyoutan matsukikikeihouhenkansouchi - Google Patents

Description

[Detailed explanation of the invention] This invention is based on the "open" and "
The present invention relates to a security terminal equipment alarm conversion device that converts the "closed" action into a sine wave and outputs an alarm.

As shown in FIG. 1, this type of conventional device has a security terminal equipment alarm output contact S1. So are connected in series, with one end connected to zero potential and the other end connected to device input terminal 1.

During normal operation, security terminal equipment alarm output contact S1゜S2...
- Since Sn is all short-circuited, the device input terminal 1 has zero potential and the alarm buzzer 4 does not sound.

In the event of an abnormality, the security terminal equipment alarm output contact S1 (or S
2...So) becomes open.

Then, the device input terminal 1 has a potential sufficient to make the transistor 2 conductive, the relay 3 is activated, the contact 5 is closed, and the alarm buzzer 4 sounds.

Therefore, in the case of this device, it is easily affected by the structure of the building in which the security terminal device is installed, the installation location, the wiring route, induction caused by lightning, etc., and is extremely unstable.

In addition, there were drawbacks such as limitations on the number of security terminal devices installed, the length of wiring materials, and the duration of the ``open'' or ``closed'' state of the security terminal device alarm output contacts.

This invention eliminates the above-mentioned drawbacks and provides a security terminal equipment alarm conversion device that converts the voltage generated in the transformer into a sine wave of a constant frequency when the security terminal equipment alarm output contact is "opened" or "closed". provide.

An embodiment of this invention will be described with reference to FIGS. 2 and 3.

Security terminal device alarm output contact S1 connected in series. S
2... One end of So is connected to the DC power supply 12 via the variable protection resistor 13, the other end is connected to a transformer 14 for detecting changes in current, and a capacitor 15 is connected to the transformer.
Connect in parallel.

Next, the transformer 14 is connected to a relay 19 via a diode 16, 23 and a transistor 17, 18, and is connected to an alarm buzzer 21 via a contact 20 of the relay, and the buzzer is connected to a transistor 1B.

Furthermore, a surge killer diode 22 is connected in parallel to the relay 19.

Note that the diode 23 is for positive feedback, and the transistors 17 and 1
A DC power supply 24 is connected to 8.

The operation of this invented device having the above-mentioned configuration will be explained.

When any contact, for example Sl, is opened by an alarm input, a voltage is generated in the primary coil m1 of the transformer 14 due to the current change shown in FIG. The frequency is converted into a sine wave (Figure 3b) and output between A and B.

When the sine wave is applied to transistor 17.18, 1
The loop 19 is activated and self-maintained by the positive feedback diode 23, and its contact 20 closes to drive the alarm buzzer 21 to issue an alarm and report an intrusion.

This devised device converts the security terminal device alarm output into a sine wave by the coupling transformer 14, so depending on the structure of the building where the security terminal device is installed, the installation location, wiring route, lightning, etc., Sl, S2... It is extremely stable as it is not affected by the induction that occurs in a circuit in which the security terminals are connected in series, and is very stable due to the number of installed security terminal devices, the length of the wiring material, and the "closed" state of the alarm output contact of the security terminal equipment. To reliably output an alarm regardless of the time width of the "open" operation.

If there is only one alarm output contact, the contact will change from "open" to "
Closed” and outputs an alarm.

[Brief explanation of the drawing]

Fig. 1 is a circuit diagram of an embodiment of a conventional detection device, Fig. 2 is a circuit diagram of an embodiment of a device according to this invention, Fig. 3a is a waveform diagram of a signal generated in the primary coil m1 of the transformer, and Fig. 3b The figure is a waveform diagram of a signal generated in the secondary coil m2.

Claims (1)

[Scope of utility model registration request] Security terminal equipment alarm output contact S1. S2...So is connected in series to the DC power supply 12 via the variable resistor 13, and this is connected between both ends of the primary coil m1 of the transformer 14,
A capacitor 1 is connected between both ends of the secondary coil m2 of the transformer 14.
5 are connected in parallel, and diodes 16 and 23 and transistors 17 and 1 are connected between both ends of the secondary coil m2 of the transformer 14.
8, a circuit consisting of a relay 19 and a buzzer 21 is connected, and a surge killer diode 22 is connected in parallel to the relay 19.
This is a security terminal equipment alarm conversion device that converts the "closed" operation into a sine wave using a transformer 14 and a capacitor 15 and outputs an alarm.